The mother of a 3-month-old baby is concerned because the child is not able to sit independently. How should the nurse respond to this mother's concern?

Choice A reason: While some babies may begin to show improved head control and trunk strength around 4 months, sitting steadily without support is not typically achieved until later. This statement may set unrealistic expectations. Choice B reason: There is no established correlation between sitting ability and tooth eruption. These developmental processes are governed by different physiological systems and timelines. This statement is inaccurate. Choice C reason: Sitting steadily at 3 months is not developmentally appropriate. At this age, infants are still developing head control and core strength. Most require support to sit and cannot maintain balance independently. Choice D reason: This is the most accurate response. Independent sitting usually develops between 6 and 9 months. At 3 months, it is normal for infants to require support. This response reassures the parent and reflects developmental norms.